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    "## 购物车程序项目：\n",
    "    要求：\n",
    "    1. 运行程序后，让用户输入支付宝余额，然后打印我们的商品列表给用户\n",
    "    2. 让用户输入商品编号进行商品购买\n",
    "    3. 让用户选择商品后，检查用户余额是否够，若够则直接扣款，不够则提醒用户\n",
    "    4. 用户可以随时退出购买，退出时打印用户已购买的商品和支付宝余额"
   ]
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     "text": [
      "请输入您的余额：555\n",
      "商品编号:0,商品名称:珍珠奶茶,商品价格:7\n",
      "商品编号:1,商品名称:大杯珍珠奶茶,商品价格:8.5\n",
      "商品编号:2,商品名称:加大杯珍珠奶茶,商品价格:9.5\n",
      "商品编号:3,商品名称:桶装珍珠奶茶,商品价格:20\n",
      "请正确输入购买商品的编号：3\n"
     ]
    },
    {
     "ename": "TypeError",
     "evalue": "'str' object is not callable",
     "output_type": "error",
     "traceback": [
      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[1;31mTypeError\u001b[0m                                 Traceback (most recent call last)",
      "\u001b[1;32m<ipython-input-27-5ae5781d1bb6>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[0;32m     36\u001b[0m                 \u001b[0muser_shopping_car\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mappend\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0mgoods_list\u001b[0m\u001b[1;33m[\u001b[0m\u001b[0mchoice\u001b[0m\u001b[1;33m]\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m     37\u001b[0m                 \u001b[0mAlipay\u001b[0m \u001b[1;33m=\u001b[0m \u001b[0mAlipay\u001b[0m \u001b[1;33m-\u001b[0m \u001b[0mgoods_list\u001b[0m\u001b[1;33m[\u001b[0m\u001b[0mchoice\u001b[0m\u001b[1;33m]\u001b[0m\u001b[1;33m[\u001b[0m\u001b[1;36m1\u001b[0m\u001b[1;33m]\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m---> 38\u001b[1;33m                 \u001b[0mprint\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;34m\"%s已经加入您的购物车，您的余额还有：%s 元\"\u001b[0m\u001b[1;33m%\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0mgoods_list\u001b[0m\u001b[1;33m[\u001b[0m\u001b[0mchoice\u001b[0m\u001b[1;33m]\u001b[0m\u001b[1;33m[\u001b[0m\u001b[1;36m0\u001b[0m\u001b[1;33m]\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0mAlipay\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m\u001b[0;32m     39\u001b[0m             \u001b[1;32melse\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m     40\u001b[0m                 \u001b[0mprint\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;34m\"您的余额不足，请更换支付方式\"\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
      "\u001b[1;31mTypeError\u001b[0m: 'str' object is not callable"
     ]
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   "source": [
    "                                    # 商品的数据信息\n",
    "goods_list = [\n",
    "                                    # [商品名称，商品价格]\n",
    "    ['珍珠奶茶',7],\n",
    "    ['大杯珍珠奶茶',8.5],\n",
    "    ['加大杯珍珠奶茶',9.5],\n",
    "    ['桶装珍珠奶茶',20]\n",
    "]\n",
    "user_shopping_car = [\n",
    "    \n",
    "]\n",
    "\n",
    "                                    # 用户输入 使用input ，input的使用，结果是一个字符串\n",
    "Alipay = int(input(\"请输入您的余额：\"))\n",
    "\n",
    "while True:\n",
    "                                        # 循环遍历商品列表，将商品信息按照一定格式输出\n",
    "                                        # 一定格式：商品编号：xx，商品名称：xx，商品价格：xx\n",
    "    for i in range(len(goods_list)):   # range会根据商品列表的长度变化而变化\n",
    "        print(\"商品编号:%s,商品名称:%s,商品价格:%s\"%(i,goods_list[i][0],goods_list[i][1]))\n",
    "\n",
    "\n",
    "                                        # 让用户输入商品编号进行商品的购买\n",
    "                                        # 用户输入的内容是否符合规范（用户的东西有没有）？\n",
    "                                        # 思考：用户除了输入数值外，有没有可能输入的不是数值\n",
    "    choice = input(\"请正确输入购买商品的编号：\")\n",
    "    if choice.isdigit():\n",
    "        choice = int(choice)\n",
    "        if choice > len(goods_list):\n",
    "                                        # b.如果没有该商品，返回没有\n",
    "            print(\"您选择的商品不存在\")\n",
    "        else:\n",
    "                                        # a.如果有 判断金额是否足够：用户Alipay 商品的金额 goods_list[choice][i]\n",
    "            if Alipay > goods_list[choice][1]:\n",
    "                                        # 用户余额够 1.增加该商品到用户购物车 2.扣除余额\n",
    "                user_shopping_car.append(goods_list[choice])\n",
    "                Alipay = Alipay - goods_list[choice][1]\n",
    "                print(\"%s已经加入您的购物车，您的余额还有：%s 元\"%(goods_list[choice][0])(Alipay))\n",
    "            else:\n",
    "                print(\"您的余额不足，请更换支付方式\")\n",
    "    elif choice == \"q\":\n",
    "                                        # 用户退出购买\n",
    "        print(\"用户购物车：\",user_shopping_car)\n",
    "        print(\"您的余额还有：\",Alipay)\n",
    "        break\n",
    "    else:\n",
    "        print(\"请输入正确的编号！！！\")\n"
   ]
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